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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62051c724879d099349a8a5945eba250299ed10ecd3ddd04def7a7f451c3e119' 
  AND token = 'hMgW0Xzw5BnhzIXE1MfElnJZmP1TtT4skcmq3AdpY/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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