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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1205ebcb5a4174c0cdecfcda435689c8c66845ae2056120027f81524d93fc122' 
  AND token = '/RFCw1w7KoBHZ5iq582AtWESr69YECGVuTXg4P+36Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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