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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df5306a9062aec47e9403e998c6728f769475bbcd231c9a0edc8c91686d3dc5' 
  AND token = 'KhcdtZl8rojagWsHXop2/J2mna/ihTCAK3thV/sKc50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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