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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886de5a193f82d1ecd5b7b2e7503b51f59b3593cff3ef179eccfe011ec1a9148' 
  AND token = '8k82nSk9G3Tj7IGRPQZarcYUZBNjuwOAIZIQFV661ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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