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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbdd542c92e83d55eb8a3e2aacd347303385c594136b9571690a3633cdddc0d' 
  AND token = '3D2VUMCuDNwmIC7Q6XFMGO4bjw+f9P9+te49ktgmTw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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