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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7119ec8d2418e0a31255f42fd0f1c54283c2c9fde61511ea58aab99d9966ba18' 
  AND token = '8a6vy/IuRszU034RMBDfH7FM/4AY+lRjP3Ob5HyEMm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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