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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d2bcdcb1f97a44b81c6c0567da6d0de9c84992dcef5da32f2aed88f3ac8136' 
  AND token = 'yKqRti/NJ64ShcBSNwOdWekGoWmKR9ZkN0yoecYWhiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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