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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f4eef00da8720de4fca46eb00e47520763ae2adac2cc7e1907cd8dfeca6c0e' 
  AND token = 'tSUzFnjCONGfcZilXx3nRb/9u/GBIt1oGeCIbsfUJzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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