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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fe49d305fc9afe537d90b60fd0eb032a345cdfd0dc51491827769132d70dcd' 
  AND token = 'S3buiPnyq4uOFP9b4ER6mANFOUIOD2kw3hA24I+j7qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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