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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f8a14b36631618cbaeb060406a719be739ef5cede7c02cec70f7712b234a27' 
  AND token = 'vO8HwrwHK3hGwdx8bQVBx8Rkf1vFFirAirGNs3C8gTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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