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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78ee29bf1cdc29249aa6453b4d0ffeb5cf8a4ce060a22d7459e87ee69edca93' 
  AND token = '9OUi3l77mSdNrFJjvJlqU2hSJ4whgSRazrpkwNfu4GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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