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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e237de0a4d36589740907c8d4636896767a8981e33b17bbe27d0d30e85a98b40' 
  AND token = 'SXygY85B2y5fW37xptAdvXrJu2dBOsbqc1E4JAT6MRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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