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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5522feb0c40a92e62cf42c142b97b8bde96f6ca42c8ba3dcece1ad7f87f6d60e' 
  AND token = '/wSze42jZboYdAVt9GpjdG7WpyxhsXUAPQki1CaSCRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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