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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905a37f8c4a273f22105294c3be7dc5d0cd06feac675584690bffb6e4461a570' 
  AND token = 'mIhiEThqdQzVYVMt9xHqciBMfC13qqlIJ94DDNNj/XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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