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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fbd7a5266670fab3976e044f67265b5a658f4b54c56f6c89403ccfca2149e6' 
  AND token = 'yoBL7edKmC4CU6bD4eny18oQCnxcQBHU4K+/0jCKJY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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