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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124b0b964b1efe2d11c0eb9a386d4d9f659abe7bcce7d100e93169ae7d6bd7e0' 
  AND token = 'o7C7bAYvC10F9YxBffY7jvQJKemgesRDzj2nwIdF+NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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