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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70088c2c987c88d7092a03ff99a3c036fef86f5c83766d41ef814032b62e1d1b' 
  AND token = '2VWC60bCztltacvu1TPxaozBdOlJVzDVW6rwq2Vylgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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