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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764e80ceb5dcd6a27872df3e6434bad76614cb077d6a662fd72d7361db63618d' 
  AND token = 'EqBKyV233OdkOf0dWu7kHUxqku5WyoqTPI9PcUotXZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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