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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b7911b80c743c73ed1932691abab1013a007ed6db2362666c40783047aeca1' 
  AND token = 'XBJnThV5ZKb6GjTLiC9Tpt+AwxNEnoDY3xlyxkIy0j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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