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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e116bb7f8bed0bb300751ec17bd0afeb476574eb55d2250fa9ecbf27655359' 
  AND token = 'Jqc1zEj+jJJN19upGPgNKtcPzSiI8y707LABm/lVyHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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