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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2acb84d143425b441a1cf7e91c340d0dc8c345d697269f850fd3945d0242bbc' 
  AND token = 'fuASa/Uak7jLCB4veSqLbJ7nMz10vJaZPlt0kcybOkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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