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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f10b47efbfe2adfea150cbeb633c7fad3fbe0207cb5281d16703c3a264e857b' 
  AND token = 'Sc8EY11WA895ZkdP9TahjTHrypNzbFSXNFs4xNfxIuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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