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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b3b4dcd84d7e93caa77472da555e732b6d13b322056445215baaf4e303c9cf' 
  AND token = 'rL2sodZD5kQP5+pck0KSa7HcluzaJmNfKK00+D5m3Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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