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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3432d7e31f0ebeb8fccf754381b304758fee2ee98c0e1a536333bc5107381417' 
  AND token = 'TaN6Sn1kyFahOQ6ZaZolbrHgNqzQhi5fKT8cL2V//uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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