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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4aaa4b9b428b370b404eba1ec6c7a874b18da3e71445070287f9d5eb82cf5a' 
  AND token = 'ne9mJ/ScFODIbnDC0HEtJzYNwj/u5YAWyedRH4Qn21s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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