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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583922c32f7de5b901f9abf2c767e28acb625986014eac2bbcaf7276050757e3' 
  AND token = '9hEbqfatQrmEhchlH27FWgR/EhNfvqGxD9FkUfBh4xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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