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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42f4c02f3288d0be1d8de689b1f093a6c8d21687c9b455f8ad86be48e87ba4c' 
  AND token = 'ZpZ6Ln4yF0YhfYw6TtVKDyg70D6BrRWiCdTligd/E3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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