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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935dccfbf5d58ca5a0b29ad2a6befef12195c8c7deabe3da5f4e47c0e5834ef7' 
  AND token = 'wQYQAzCUwKdPqeVefsRKY40fcCbcJL4x0lFyNKT4Wds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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