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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b1f39563438bf5b11d1dc41371481b94ee4a73e52fa895902f5a54fb03f984' 
  AND token = 'OG08P4mpnD2fQU5omf3N6rqHBjW+fE8vUkmTQUbzaeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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