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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003d1c579d83d7e28a9186313fe58ba3369c849466ce015a95f3fd2fd78d4ad5' 
  AND token = 'QoAOe9ggcowL7SYYfADCJCLNvhPGCSR3n5De+wwJHno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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