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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a0b39fae7eb8a04373c8a9ca573ab7b953f40b9832ca9e3b92925cdf226fe2' 
  AND token = 'f8CprEbnJTcvBnPaJPZ3IoiD45ckTsWhJ8SdXSxj7k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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