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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b337993b82ddebbceb8cac14a8d28622e878a6a175662d384c473e01ce08d801' 
  AND token = 'Jx6OSRNzuP47t6oBOYBX5qeK6jo5BAo3r4andG6bb/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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