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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629d7c27c5e00a1f5fb72a6e51dac8f787bdc6886823980cb7683715260e854e' 
  AND token = 'GD2Hv0S5MfHB1tQ4+4qnvGcfUQULdsl+XBhpGjT6cTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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