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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a214cdbeec8da2b41be3cbe1a978645e3ae6d7c58bad8aa25591ebeb5a2b34f9' 
  AND token = '59wg5TpG1iMAYfdhuqWe9UpUi9bkuNFWuk/eEiDmPQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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