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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2808ea430edf6fd3394bf4a3c2c30b3b1e9b45f180c2ce3349dc41bf6d1b8b13' 
  AND token = 'z/CpFMcXIKRQt+ZPDpuc968KJXa9SB8pONaHF1zjxpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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