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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2251ff34472637a024c89d40c047e912208d3c4287ccdac0bb159c15e9d11f' 
  AND token = '9qbeSUhcRkwM1Ck8QDia/aiPxKtHAJOerMvaJ9TTzZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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