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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9897b505ba8866269850cf477b6a36d1ab9caab600b8b58b3ac2e7f4d8f7ad' 
  AND token = 'He+szWzg/BzQqo/0jOrCyqRPO9Qe5e6h9B3bEDu1TDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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