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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27c7492c75c4af5cfe7cd0079abc330d374c2fc0b5283a2ace48736857f6926' 
  AND token = '9i4mOK6C1zsv1OEzz7qVyzHTE0/7VddOZJjIrdQWKTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}