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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d138c81dc715d3970c87b73988133b46a65cf5a9aa938abd516c07bc4620ab' 
  AND token = 'ARADqwsfHd4p6dSxb0hh2PXLgyzWEU02Yoh1m66Fxnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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