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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541c4fb05aae4ae1b9a49aa1b736482fba2f376b6a603adb2d645817ea5b7e14' 
  AND token = 'l8zhklGqXqXQk66JQXCFc1CLN5w8mGGPddQqqj4BR4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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