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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa70fe5f10afba7f8e366e15f87aee8a17c6d9135a7102071592bbabf8bf92c' 
  AND token = 'RuL1c8WolauyP9TeWRLMqsqRdH6MPwGbVz9Hl2EW2Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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