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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56098b28dc09f1c81b50cd2341dc09ab5e55a55bc32079b56d6c384f5b318df' 
  AND token = 'J2uwF2YjN0oofjw+0WcexCG8WLwz0gpChDXnSej3rXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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