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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d3f835ec681cdfa8dbf29fcf4bf136e52195d97e27a2cb8b26b3bcf6d6fbcd' 
  AND token = 'IVLcmeGW0mpRpy3giRLI0J7LhnlgMB7HbYor7UooTRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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