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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a9827d247dd2c377c1bc086bd82442c7c276516d39d270ca03df4209e76e31' 
  AND token = 'lZjI53yIeyW6f54VJjOvxZgRku6Ky8jyxNdEY32DJik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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