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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6345d7667c9b7a5a7b8214c878351d6de64fd4752584165fa930eecbc099b73e' 
  AND token = 'idV/iujFu03GUGX5Pp60XNRqA4Dz1gYO78STb8xQIBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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