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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbf45aceb40f5b0d5f5f4169a4ca710e8df2b61d88cd2b8c62605ff2175b872' 
  AND token = 'ovDNQmhHNli5D8wbZOz2Ut9DR0qsDEIDH+yPT8aJ2Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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