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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7699121234eabd25cd15654aa9f4c7f5ab22e0b1ba032d2504c3a70a0556ca6f' 
  AND token = 'pGIJShWTB3uPXOW9vxEqm9DU40R91U5UMsug55pRHQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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