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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db32f46e35a2e4121d99608cc943d466c2a69fefe49f53e1d832703e36e7e4e' 
  AND token = 'Rw4a94JHqLkSnWzjJmh9geNdSMqjVStjcCZRl7ajY8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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