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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8f80b9c2af7e4f2fcb6200de9a241a9963953022ce328aae4b362babf248c9' 
  AND token = 'SnWHxVAknPcwWWaL4fKmsf1A/vQ5HkNuXy+xi9d3fzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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