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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7b7c26ee745b3a2a63ad4f53221adacc5eb219b919474550ef1da53ac219b9' 
  AND token = 'wnopbMUetoWGYT8WAIwbzrZuK6sQFxKyacrMtvhQHhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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