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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218e09ca009d880fbe649a4aff3696fab4a2fc4109ef0d677688256a11599ba6' 
  AND token = '+DQLaf6EQbQETL1FHQKB0N4UuJTCbzRuu+oP9lcUGY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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