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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76473d942e2996cc024886ee93d7611e2ca791d1b72bfc8d9c21bc4ca61430bc' 
  AND token = '7FSGgxzjHQEyhXGJldMmXiQd9KWSOvXJvGtmi2MT37A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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