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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25df5ceb09141fd2c629429329ed3335d333dc5d12cf9c01dfc01153fe0607ce' 
  AND token = 'DoFQFA/ot2ncxD9aqZk6QgmtWREKGY8id/Kr+31PpGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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