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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea753c17b72ef65f9ca2703f8a1e8ef8f2ef301777824205119ec8d940d5c92' 
  AND token = 'YVXGRgUEzt/o0YdGar6UmVcG4k354ZkX8xTZqgM/kcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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