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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daeec96a5d2dc66812f11b9e36a452f1bd51749481893a7e1cd9644e8607c208' 
  AND token = 'wWjwyAYKDRojIThwph5wf154Wk5Amx5KvbEkAz1LBeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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