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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65dc39c3f36a386f18c2616f646a15545784ff5af2f59bb8db5c58d9b6497fcd' 
  AND token = '+tKoQc4jtVEs8gNlICnHAlonGGS8NjlMeFzm+u6c+G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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