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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994a66af11967cb94e0f9498dc6ef3348ad87b673f2d6bd938d8b5dc73bf925a' 
  AND token = 'XrFTGaXUygMXR1AgIeHrd9hh31hV4POWUOdCW8LgzNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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