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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c466f9fee793bf60c6f4b71b70642a8158027bb23e8b6c8c32f16a643f7c6290' 
  AND token = 'i9sExJ0H6AQakLQ/L/XxMYBOuUGTCJk8Wp7BPEAn0PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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