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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8841326d0601007934f75f9cd0bf299431322b57614bc345059364a4c74d7281' 
  AND token = 'HW5g696el9y7C6arLKuZvepOW9XV9zZghHh21Wjy6bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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