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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6933ee7f0a9c68e62fa4ee4f484854f740b3998185dec25723969c04d7c6904c' 
  AND token = 'x77+5vUHJlxqfwPphfff3mzL75M+9DLy0XFRDui2xfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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