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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81efc2c149036c3d8302041fbb6472ed63c1684e78c46f2b596272d8d7da6466' 
  AND token = 'xGjDzcicgc4DscVvI24BINRCH5s6KSKccAjTWpkYEyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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