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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eaeee9ff025398c9d916a22b4977721802b3d1de96a7caded798be5e0998cec' 
  AND token = 'yANeqwj5euscQsHoZJxLiRtLYLxUqXp4o+GIe3sbErw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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