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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736521a109b8dc6b96f6209d4512b85976d1116b07e1d7866013a91f606e80f6' 
  AND token = 'OEEHPGzr7000baIIHlXOYo+QBixnI6mf0l15u8ZCc3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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