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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f73e66bac5619ce4cb3b2307144396ec02ef950514beb7c40efe8cd951e75ce' 
  AND token = 'MYdmuSWkMXmWW5RVqbe31nvOG+/WjdvzNKR9AibmUYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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