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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fda653d34f63d066ba104c2dd69a007dc27fbb8b5848576f66d967c76b7afd' 
  AND token = 'xgqe8CpSaHFNwWjPQlTNFeavSfgHROH4dNhPcF1s8Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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