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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b71e645ac0f24b5e1ed9b9303fbe2ad4f0c3f7ffa9db30a868058e0e641f0e0' 
  AND token = 'JlnImcvnMyWBsnEMA8dNLnocVXls9y70EKy1ezeRKvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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