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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68df9508ab29f51efd7655d03a25db288e3a82cf4ef858030a56751ded69b21' 
  AND token = 'TlotcIQRn3JPX0fSdT+/v11Hp4v74/7z1JPwZ4CyBks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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