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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39566b51515c29e2358332be551d76aedac03b8184de3986df7a7d107424d0d2' 
  AND token = 'Bbl59rMIrvvqPu0NvPjH8zUR/k6zPPYPp0t0aMxfNqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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