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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790fbf3dbabe0cf53468c3e7b428e038e4669a32ef25b9f5513f4cd0ac5ce9a4' 
  AND token = 'j7mQQ4iqV+cNt1c+hPhNnfVXnhyYL1u6fECACOqFxe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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