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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b64ad47072d39162d9331f4ca749636f751dc5dd11fc01a26ba32d07d3b7e0e' 
  AND token = 'OECByD0348oW2TGPIiGL0IfEtO/RjQ77n6POKd/4Pck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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