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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc605b1fd2714dde5ff9aaed9f5e2a11ca9dfd51b76edb7550f5da0d852d477' 
  AND token = 'BcEuGGXUYt0LhK8hF4Y1hnRZIS6YFZcAi3nUNKLjJz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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