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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cd921d2200d1b4922c2965eadc88f34854b257d7f6e5e799eb970e41ab1303' 
  AND token = 'bPI7+Zm9D+d9tarecFypVDNMYhwOy+2xvZ9GlpySVU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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